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နောက်ဆုံး ပြင်ဆင်သည် ဩဂုတ် 15, 2026

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Imagine a packed ballroom full of the world’s top urologists, the air buzzing with tension — not for a surgery, but for a debate. The topic? Whether a particular ultrasound test of the penis is, as the session was cheekily titled, the best thing since sliced bread — or a complete waste of time.

I had the privilege of witnessing this academic showdown firsthand at the American Urological Association (AUA) 2026 meeting in Washington, DC, while shadowing Professor Mohit Khera, a world-renowned expert in men’s health. The test in question is the penile duplex ultrasound (PDU) — a scan that measures blood flow inside the penis. Two brilliant experts went head-to-head: one defending it as a potentially life-saving window into a man’s heart health, the other dismantling it as clunky, unreliable, and often pointless. Here’s what this fascinating debate can teach all of us about modern men’s health.

First, What Is a Penile Doppler Ultrasound?

For years, doctors assessed erectile dysfunction (ED) mainly through questionnaires — helpful, but they cannot see what is happening inside the blood vessels. A penile duplex ultrasound goes deeper: after a small injection of medication that relaxes the blood vessels and produces an erection, an ultrasound probe measures how well blood flows into, and stays inside, the penis. In theory, this reveals whether ED is caused by a blood-flow problem — and that is where the disagreement begins.

Who Actually Does What During the Test

Worth being precise about this, because patients often assume one person does everything. At Bangkok Hospital Headquarters the penile duplex study is a team assessment. As the urologist, I give the intracavernosal injection, decide whether a further dose is needed during the study, and interpret the findings alongside the rest of the clinical picture. The ultrasound imaging itself is performed by a radiologist. That division of labour is a strength rather than a limitation — the quality of the scan depends heavily on the person holding the probe, which is exactly the weakness the debate below turns on. Penile colour Doppler assessment was part of my andrology fellowship at Chang Gung Memorial Hospital, Kaohsiung, in 2019, under Prof. Po-Hui Chiang, which is where I learned both how to read these studies and how easily they can mislead.

One safety point that belongs here rather than buried at the end. The injection used to produce the erection is the same class of medication used to treat ED by injection, and it carries the same risk: an erection that does not go down. If an erection lasts longer than four hours, that is priapism and it is an emergency — not something to sleep on and mention at the next appointment. Blood trapped in the penis loses its oxygen supply, and damage to erectile tissue can follow. You will be observed after the study until the erection settles, and told exactly whom to contact; if you are already home and it has not settled, go to an emergency department and say that you had an intracavernosal injection and when.

The Pro Side: A Window Into the Heart

The first expert made a bold case: a penile ultrasound is not just about sexual function — it can be an early warning system for a man’s entire cardiovascular system.

Planning Better Surgery for Peyronie’s Disease

The pro side pointed out that erectile dysfunction and Peyronie ၏ရောဂါ (curvature of the penis caused by scar tissue) often go hand in hand. A large share of Peyronie’s patients also have a hidden blood-flow problem — most commonly a venous leak, where blood drains out of the penis too quickly to maintain an erection.

Why does this matter? Because surgery to straighten a curved penis will not help if there is an undetected venous leak. The patient could end up perfectly straight — but unable to get an erection. By spotting these hidden issues before surgery, the ultrasound helps surgeons choose the right approach: a straightening procedure versus going straight to a penile implant.

The Canary in the Coal Mine for Heart Disease

This was the most compelling argument. The blood vessels that supply the penis are tiny — much smaller than the arteries feeding the heart or the brain. Since artery-clogging plaque builds up throughout the whole body, it tends to choke off these tiny penile vessels ပထမ, long before it blocks the larger, more critical arteries.

The powerful conclusion: blood-flow-related erectile dysfunction is often the very first warning sign of silent heart disease — sometimes appearing years before a heart attack or stroke. From this angle, the ultrasound is not just a sexual-health test; it is a potential life-saver, allowing doctors to send at-risk men to a cardiologist for early heart screening and prevention before disaster strikes. This is the argument set out at length in why erectile dysfunction is your heart’s early warning system.

The Con Side: Clunky, Unreliable, and Often Pointless?

Just as the audience was ready to declare every man needs this test, the opposing expert delivered a sharp, practical rebuttal.

The Results Can Be All Over the Map

The con side showed that the test is highly dependent on the person performing it. In one striking example, the very same patient gave wildly different readings depending on which side of the penis was measured or the angle of the probe — one side looked borderline abnormal, the other looked perfectly healthy. The pointed question to the room: which result do you believe, and would you really base major surgery on a number that shaky?

Anxiety Can Fake a Disease

To get an accurate reading, the penis needs to be fully relaxed and erect. But picture the setting: a cold clinical room, bright lights, a doctor holding a syringe and a probe. For most men, this is the opposite of relaxing. The resulting rush of adrenaline tightens the blood vessels — exactly what the test is trying to avoid. The result? A perfectly healthy man can be falsely labelled with severe vascular disease, when his only real problem was nerves in the doctor’s office.

Does It Actually Change the Treatment?

This was the heart of the con argument. The expert walked through the common situations and asked, in each case, whether the ultrasound would actually change what the doctor does:

• ED that has not responded to pills: The next steps (vacuum devices, injections, or an implant) are the same regardless of the exact blood-flow numbers.
• Peyronie’s disease: A physical exam and an in-office assessment can map the scar tissue and the curve. Treatment is guided by the degree of the curve, not the ultrasound.
• Priapism (a prolonged, painful erection): A quick blood sample from the penis is the gold-standard test — not an ultrasound. And it is an emergency in its own right: an erection lasting more than four hours needs to be seen immediately, whatever caused it.
• Penile fracture: A sudden bend with an audible crack during intercourse, followed by pain and rapid swelling, is a surgical emergency needing repair the same night. If imaging is truly needed, an MRI is far better than ultrasound.

Even the Experts Cannot Agree on the Numbers

Finally, the con presenter highlighted that there is a surprising lack of large, high-quality studies proving the test improves outcomes. Worse, major medical organisations around the world disagree on the exact cutoff numbers for diagnosing a venous leak. This means a man could be told he has a serious vascular problem in one country, but be considered borderline normal in another — based on the same result. The blunt conclusion: if it does not reliably change outcomes and is not even standardised, is it worth the time and stress?

The Verdict: A Powerful Tool — When Used Wisely

When the debate ended, the room burst into applause. The beauty of it was not a clear winner — it was the balanced middle ground where the best medicine is actually practised. The takeaway, and the philosophy Professor Khera emphasises in his own practice, is this: a penile ultrasound is neither a miracle screening test for everyone nor a complete waste of time. It is a specialised, powerful tool that must be used selectively and interpreted with care.

Here is how thoughtful urologists apply it today:

• Not for everyone — only specific cases: It is best reserved for situations like young men with unexplained ED, ED following an injury where vascular damage is suspected, or severe Peyronie’s patients deciding between complex surgery and an implant.
• Beat the anxiety problem: Doctors should use effective medication and be willing to re-dose during the exam so the test is not ruined by nerves — while watching for the opposite problem, an erection that then refuses to settle.
• Ask the right question: One brilliant clinical tip from the session — simply ask the patient how the erection he has right now compares to his best erection at home. If he says it is only half as good, the doctor knows the numbers are skewed by anxiety and should not be trusted.
• Connect the dots to heart health: If a young, otherwise healthy man genuinely has poor penile blood flow, he should not just get a prescription — he should be referred to a cardiologist for proper heart-risk screening.

In practice, the ultrasound is one step within a broader assessment rather than a standalone answer — which is really another way of saying what I have written before: erectile dysfunction is a symptom, not a disease. You can see where the scan sits in our ED diagnostic pathway, alongside hormonal testing and cardiovascular risk profiling.

Watching world-class clinicians passionately debate something this specific reminded me that medicine is never a static set of rules. Being a great doctor means blending open-mindedness with healthy scepticism — seeing a test’s potential to catch life-threatening heart disease early, while also having the wisdom not to over-test, over-diagnose, or over-stress the patient in front of you.

If you are experiencing erectile dysfunction, penile curvature, or other men’s health concerns and would like a thoughtful, individualised evaluation, Dr. Soarawee Weerasopone consults at ဘန်ကောက်ဆေးရုံ